60 Seconds

Ice up and down

The US National Snow and Ice Center reports that the average extent of sea ice in the Arctic for February was the fourth lowest since satellite records began in 1979. Meanwhile, Antarctic sea ice is up slightly&colon; its summer minimum is 88,500 square kilometres above the average for 1979 to 2000.

Shakers and movers

The magnitude 8.8 Chile earthquake moved a city. Using GPS measurements, Mike Bevis of Ohio State University, Columbus, and colleagues found that Concepción, the closest city to the epicentre of the recent quake, moved around 3 metres to the west. …

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